Fixed bug allowing client to be in two different rooms at the same time

ChatApp/src/server/Server.java

@@ -50,7 +50,8 @@ public class Server implements PacketHandler {
 			return false;
 		}
 		rooms.put(roomName, new ArrayList<>());
-		rooms.get(roomName).add(connexion);
+		leaveRoom(connexion); // Leave the current room (auto handle if not in a room)
+		rooms.get(roomName).add(connexion); // Add the creator to the room
 		return true;
 	}
 
@@ -68,6 +69,7 @@ public class Server implements PacketHandler {
 	}
 
 	public boolean joinRoom(String roomName, ServerConnexion connexion) {
+		leaveRoom(connexion); // Leave the current room (auto handle if not in a room)
 		if (rooms.containsKey(roomName) && !rooms.get(roomName).contains(connexion)) {
 			rooms.get(roomName).add(connexion);
 			return true;